package com.RuiJi.controller;

import com.RuiJi.utils.R;
import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * @author Twinkle
 * @PACKAGE_NAME: com.RuiJi.controller
 * @NAME: CommonController
 * @USER: Twinkle
 * @DATE: 2023/4/8
 * @TIME: 13:24
 * @YEAR: 2023
 * @MONTH: 04
 */
@RestController
@RequestMapping("common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {

        //原始文件
        String originalFilename = file.getOriginalFilename();
        //获取文件后缀
        String substring = originalFilename.substring(originalFilename.indexOf("."));
        //重写UUID
        String fileName = UUID.randomUUID().toString() + substring;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断目录是否存在
        if (dir.exists()) {
            //若不存在，重新创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过流读取文件
            FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));

            //输出流，通过流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("img/jpeg/jpg");

            int len = 0;

            byte[] bytes = new byte[1024];

            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}
